in upstate new york. a gunman who ambushed and killed two firefighters left behind a chilling note about his deadly plan. with more, abc's linsey davis is here with the latest. this is a tough one. >> reporter: it really is. lots of new developments to report, including that the death toll has risen to three. and the gun recovered by police, a semiautomatic bushmaster, the same used in the elementary school massacre in newtown, connecticut. investigators continue to comb through what's left of this webster home. the scene of an ambush attack set by this man, william spengler, that killed two firefighters and injured two others. overnight, news that a body has been found in the rubble of the spengler home, possibly his sister, cheryl spengler, who neighbors say he had a strained relationship. emotions are high, as firefighters face the grim reality of burying their own. >> tried to put down as many people as possible before stopping. >> reporter: police say spengler fired from a nearby berm or hill, as if